It looks like a 555, it says 555 on it, but it actually seems to be a 555 QAQ
Can be used, easy to use
Power supply range 3.3-7.5V, output current ≥200mA
Can form monostable, astable oscillator circuits, Schmitt triggers, logic gates, etc.
Note: There is no schematic diagram or BOM when drawing the circuit board. There is a picture of the resistor value in the compressed package.
All NPN tubes use 2N3904, all PNP tubes use 2N3906
You can also use 9013/9013 or 8050/8550 or any cheap universal P and N matching tubes you can find
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